Django-tables2-column-shifter

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* Add the ``$.django_tables2_column_shifter_init`` api to initialize the column shifter
for tables that are added to the DOM after the page has loaded (spapas)

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* Add possibility to exclude columns from shifting via `column_excluded`
* Support for Python 3.10
* Support for Django 4.0
* Support for Django 4.2
* Support django-tables2 v2.5.3

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* Fix small gaps for documentation in README.rst file

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* Support for Django 3.2

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* Migrate tests from Travis to GitHub Actions + drop tests for Python v2.
Stil, tests based on 'tox'.

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* Support for Django 3.1
* Tests with django-tables2 v2.3
* Add support for Bootstrap5 - issue 19
* Add special classes `ColumnShiftTableBootstrap3`,
`ColumnShiftTableBootstrap4` and `ColumnShiftTableBootstrap5`
* Change default inherit for django_tables2_column_shifter/templtes/table.html
from `django_tables2_column_shifter/bootstrap.html` to `django_tables2_column_shifter/bootstrap4.html`
so class `ColumnShiftTable` by default call bootstrap4 template from django-tables2 - refere to issue 18
**If you use different bootstrap version then 4 please use one of class: ColumnShiftTableBootstrap2/3/4/5 **